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Re: What is correct syntax to check for empty array? behavior diffs betw


From: L A Walsh
Subject: Re: What is correct syntax to check for empty array? behavior diffs between 4.3 and 4.4
Date: Thu, 26 Jan 2017 13:23:56 -0800
User-agent: Thunderbird



Greg Wooledge wrote:
On Thu, Jan 26, 2017 at 01:11:25PM -0800, L A Walsh wrote:

Subject: Re: What is correct syntax to check for empty array?

The number of elements is 0 if the array is empty.  So you would test
whether address@hidden is 0.

set -u                      # now add an undefined check

Now you've changed the question.  You're no longer asking whether an
array is empty.  You're asking whether some legacy crap from 197x will
make your shell script abort.

Answer: who the hell cares.  Stop doing it.
---
get a life.

I'll stop doing it when it is removed.

Otherwise, I'll see your answer as being "I don't know, so let's
call the user's choices 'crap'" -- i.e. not at all useful.

I was really tempted to add:
(opinions on use of "-u" are not being solicited) to my original
note, but I didn't want to be presume someone would be so
unhelpful...
If you don't think it is working correctly, SUBMIT A BUG.
Otherwise, stop telling people to not use bash's *documented*
features.








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